Jon and Kate Gosselin's kids are teenagers: See the Gosselins all grown up!

The Gosselin kids are all grown up! Well, sort of.

In a brand new teaser clip for the upcoming return of TLC's "Kate Plus 8," Jon and Kate Gosselin's children look so much older than we're used to as they celebrate the sextuplets' thirteenth birthday.

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Kate and the kids are seen "glamping" for the big occasion that features mani/pedis, paintball battles, actual camping and more.

See photos of the Gosselin kids through the years:

"I can't believe my brothers and sisters are 13 already!" one of Kate's older twins exclaims in the clip.

"Being in a family of eight kids, being a single mom, worrying about their present, their future, how to feed them, their college, how they turn out -- all of it. You never stop worrying," Kate confesses over footage of her children laughing and smiling plays.

Watch the teaser for "Kate Plus 8" below:

The footage is from Aaden Gosselin, Alexis Gosselin, Collin Gosselin, Hannah Gosselin, Joel Gosselin and Leah Gosselin's May birthday earlier this year. (For more on their birthday, watch the video above.)

"Kate Plus 8" returns for a three-episode run on July 10 on TLC.

See photos of Kate Gosselin through the years:

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